Quote Originally Posted by LucaviX
Open C:\Program Files\Activision\Rome - Total War\Data\export_descr_unit.txt

find warband_sword_briton

Scroll down to Ownership britons and edit it to this
Ownership britons, greece

I haven't tested it, but in theory (knowing how to script) this should allow the greeks to build the Chosen Swordsman.
Unfortunately it is not so easy.
You need also to assign a texture to the greek unit in descr_model_battle.txt and if possible a sprite.
Code:
type				warband_sword_briton
skeleton			fs_swordsman
indiv_range			40
texture				britons, data/models_unit/textures/unit_barb_warband_briton_.tga
texture				greek_cities, data/models_unit/textures/mynewtexture.tga
model_flexi_m		data/models_unit/unit_barb_warband_briton_sword_high.cas, 8
model_flexi_m		data/models_unit/unit_barb_warband_briton_sword_med.cas, 15
model_flexi			data/models_unit/unit_barb_warband_briton_sword_low.cas, 30
model_flexi			data/models_unit/unit_barb_warband_briton_sword_lowest.cas, max
model_sprite		britons, 60.0, data/sprites/britons_warband_sword_briton_sprite.spr
model_sprite		greek_cities, 60.0, data/sprites/britons_warband_sword_briton_sprite.spr
model_tri			400, 0.5f, 0.5f, 0.5f
Although it would be possible (and better IMO) to create a new unit, with the same model, different skin and different name. In such case you have to include the name of the new unit in export_descr_unit_enum.txt and the description in Data\text\export_units.txt.

Moreover, the export_descr_unit.txt file doesn't control the recruitment in campaign. If you want the greek swordman to appear in the campaign you have to edit also export_descr_buildings.txt.
Furthermore, you won't have the recruit or the info cards. You have to make new ones (or copy and paste the old ones) and place them in Data\ui\units\GREEK_CITIES and Data\ui\unit_info\GREEK_CITIES folders.